Centrifugal pump



Nov. 20 i923. ,474,67l

I P. HARIVEAU r QENTRIFUGAL PUMP Filed Aug. 2, 1920 5 Sheets-Sheet 1 J5 I Jg I@ 1 2@ @i l 1 a F'. J4 n* y 2 ,4f 30 2l 3- J 22 5, 7 evs/ ,l 6' Jr 55 1s 32 .s2 Il' Ik 77| .Il L; s U

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. P. HARIVEAU GENTRIFUGAL UMP Filed Aug.l 2, 1920 5 sheets-sheet z Nov. 20 i923.

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Y CENTRIFUGAL PUMP ,Filed-Aug. 2, 1920 a@ Ala mmm ` 5 Sheet-Sheet 5 Inventor EHTweau "lr HUIS.

Patented Nov. 20,1923;

narranV sra'rlas.A

PAUL HARIVEAU, ,0F PARIS, FRANCE.

Pmmpo Fries.

CENTRIFUGAL PUMP;

Application led ,August 2, 1920. Serial No. 400,784..

This invention relates .to single and multiple disc centrifugal pumps and is characterized bythe fact that each element is composed of an end plate forming one side of the intake passage; of a'crown ring fitted with guide vanes, which completes the intake passage; by a volute suction chamber, a rotor and a volute delivery chamber; .each of these. different members forming separate castings, and the volute intake chamber being assembled withl the end plate on the one handv and the volute delivery chamber `on the other; the elements being grouped together b`y mea-ns of a bracing crown ring.

In the 'accompanying drawing, which illustrates, by way of example, several methods of carrying out the invention, vFigure 1 is a vertical section of a'single disc pump, composed of one element, with a single-intake rotor. Figure 2 is a similar view of a single disc pump composed of one element with double-intake rotor. 'Figure 3 is a similar view of a duplex pump, composed of two elementseach with; a single-intake rotor. Figure 4 isa duplex pump, composed of two elements each with a double-intake rotor.A Fivure 5 is a modificationof Figure 4.

leferringto the drawing in detail the end plate 1 is provided with two-extensions, the outer one, 2, carrying the cap 3, whilst theinner one, 4 is intended to guide the fluidas' far as the intake 5 of therotor 6, which is preferably keyed on the shaft 7 by means of a ke I8, which is provided, at the ends of the ub, with two recesses 9 and 10, in

' which 'engagetwo flexible split rings 11 and 12. The crown ring 13 prvided with guide' vanes 14, bounds the chamber of the rotor 6, and forms, with the end plate 1, the intake passage 15. lThis crown ring 1 3 is secured to the end plate 1 by means, for example, of threaded bolts embedded in the thickness ofthe vanes 14. Around the intake passage 15' is arranged an intake volute 16 with a'a'nge 17 for connecting to thesuction pipe. 18 is the. delivery volute, with flange `19; and 20 is the removable cover-plate of the pump. The shaft 7, supported on a friction reducing bearing 21 mounted in ae cap 22, is preferably provided with a bu'sh 23 partially spaced from the end Iplate 1 to provide a c shaft is also provided with a collar 25 having a shoulder 26 and a chamber 28, the respective chambers 27 and 28 being in communication with the chamber of the rotor 6,

amber 27 and having a's-houlder The by means 'of pressure tubes 29 and .30 respectively, with the object of dispensing with stuffing boxes. Water under pressure issuing from the pumpthrou'gh the tube 30fenters the circular groove28 and is then divided, the eater partreturning to the chamber of t e rotor, passing between the ring 25 and the shaftv 7 the remainder of water passing out in the op osite direction between the ring 25- and the s aft 7 The water thus .en-

ters the chamber 53 and lescapes through the outlet orifice 55. The movement ofthe water from thegroove 28 .tothe chamber 53 prevents the admission of air at the point where the shaft passes out through the pump. The crown ring 13 is provided with a groove, not shown, intended to house a cord or metallic ,segments to make tight joints. Feet 31 and 32 serve as supports.

This centrifu al pump is preferably' assembled in the ollowing order. The coverp'la'te 20 is assembled, in succession, with the volute 18 and foot 32, and the driving shaft 7, on'which the lrotor 6 has previously been keyed, being.'` inserted through the cover plate 20, the. intake volutel 1 6 is assembled with the delivery volute` 18. The crown lring 18, provided with the guide vanes 14:,Landsecured to the end plate 1, is then placed .in position. The -end plate 1v is finally assembled with the intake volute 16 and the foot 31.

The chief advantages of pump according to the invention-,are the following:

1. The pump may be inspected and dis- ,mounted without touching the intake and delivery pipes. To facilitate taking down, the end plate 1 is provided'with disconnecting screws, notvshe'wn, bearing against the intake volute" 16, and enabling the end plate 1,

crown-.ring 13 (with the guide variesV 14),

rotor' 6 and shaft7` to be detached in onel piece.

' 2. The intake and delivery oriic may that, too, independently of each other.

3. The rotor isfed uniformy, as theresult of thelong course traverse by the 'fluid lthe centrifugigall v*occupy Aany desired .relative positions, and

5. The casting and machining of vthe va rious parts of the pump are a very simple matter.'

6. The parts liable to wear* can be replacedand the other retained.

. The single discv centrifugal pump represented in Figure 2, which consistsof one element with a doubleintake rotor is obtained,l according to the invention, by arranging the different parts of Fire 1- minus the cover late ZO--Symmetrcally in. relation to a dou le-intake rotor.

This pump is assembled in a manner similar to that of Figure 1.

ln addition to the advantages mentioned inconnection with Figure 1,' this modiicaall axial tion includes that of abolishingi obtaining thrust, and consequently that o perfect axial equilibrium.

Figure 3 shows that the constituent members of an element with single-intake rotor (Figure 1 minus the cover plate 20), enable a duplex-rotor centrifugal pump', with single intake, to be put together very simply. 'lo arrive atthis result9 all that is necessary is to assemble with the pump according to Figure 1 (the cover. plate 20 oi which has been removed), a symmetrical element that is to say composed of the same members as Y those in Figure 1, but arranged in reverse and 35.

order, and to connect the delivery' orifice of the delivery volute 18 to the intake orifice of the intake volute 161. two rotors are bounded b a crown ring .35, which is centered and maintained in the desired position, referably by means of three screws (not s own which are operatedfrom the outside an engage with their ends in a groove provided in the crownring 35.

The back flow of waterfrom one chamber towards thev other, oritowards the intake, is prevented by means of cords or metal segments, forming joints, housed in suitable groovesl provided in the crown rings 13 rlhis modification presents the advantage that, when the pump is working, the edects produced by the two rotors are supplementary, as regards the delivery head of the fluid, whilst, from the fact that they are arranged back to back, the axial thrust eX- erted on the rotor 6 is almost completely' `balanced bv that acting on the rotor 36, and consequently, axial equilibrium is nearly The chambers of the.

nevar achieved. even in thebfgftwo single-intake rotors.

Figure 4: shows how, by starting from the pump illustrated in Figure 2, that is to say, one element with a double-intake rotor, it' 1s easy to obtain centrifugal pumps with double-intake rotors, irrespective of the number of rotors desired. ln fact, all that is necessary is to add a similar group to the onere resented in Figure 2, and to assemble them y means of a bracing crown ring 40,

lnside this bracing crown ring 4:0 is disposed another'crown ring 41, preferably provided, right andleft, `with a base forming one of the. sides of the adjacent intake passage. The centeringof the crown rings 13 and 41 is effected in the manner already described. The reflex of water is also prevented as set forth.

In this modification, the delivery volute 18'is connected to a central header, not

shown, sup lying the two intake volutes 42 and 43. oreover, as in the pump shown '1n .Figure 2, complete axial equilibrium is obtained.

Fiy re 5l is a modification of Figure 4, in whicuthe crown rings 13 are cast with a peripheral ridge 44 which engages in a recess arranged at the junction of the correspending volutes. rlhese joints, which are llned with a circular packing, prevent the fluid from leaking from the one element into the adjacent one and, towards the intake and, at the same time, they keep the crown rings centered. The ridges might be 'ertendedy advantageously to form flangesw'intercalated between the volutes and assem-- bled therewith. Moreover, the crown rings 40; and 41 (Figure 4) are preferably re-V placed by a single crown ring 4o.

The assembling and taking down of this pump (Figure) are evidently effected in separate portions.

The forms given 'by way of example are confined to duplex pumps with singlee-or double-intake rotors; but it is-evidently `feasible to construct pumps comprising. any desired number of elements, by simply adding to those `of Figures 3, 4 or 5, and in themanner 1nd1cated, as many slngle'dlsc ele-v ments (Figures 1 and 2) as required.

The invention thus enables the delivery head to be increased without increasing the volume delivered, or, on the otherhand, the delivery to be increased without increasing the head. The delivery head is increased by connecting (series mounting) the mouth of the first delivery volute with the intake of 'the next element in succession, by an external branch. 0n lthe other hand, the deliveryis increased by connecting the mouths ot all the intake volutes with the same headers,

liveryl vvolutes to anotherheader (parallel mounting). ln this way a pump of very 'and connecting all the mouths of the delarge capacity can'be obtained, with rotors of very small diameter, which enables high speeds to be employed.

This possibility of grouping the elements in-order to increasey the dellvery head or volume delivered, enables 'all intermediate forms of grouping to be arranged, for instance, arranging h'alf the elementsin parallel and the other half in series. Again, 1f the delivery or head exceed the /desired limits, the number of elements worked may be cut down to the desired figure. v

The invention is applicable 4not only -to centrifugal pumps for. liquid, but also. to fans, and more particularlyv to hydraulic turbines of'smallcapacity and large head. If the elements composing the turbine are connected in series the speed lwill be thelower for a given head, as the number of elements will be greater, since they each take `a share of said head.l I f grouped in parallel, they will each take a share of the volume. This has resulted in the employmentxof rotors of small diameter run at very high speed. Should the available volume of the fall dimish, one or more elements can be cut out, so that the others 'continue to act under the conditions most 'favourable to efiiciency.

What I claim is: j

1. A centrifugal pump comprising a cover plate forming one side of the intake pasvsa e, a crown ring provided with guide vanes 'w ich completes the intake passage, -aninlivery volutefeach of these di'erent parts` beingcast separately, means to assemble the intake volute with the cover plate on one hand and the delivery volute on the other, and a bracing crown ring interposed bel v tween each two -elements.

- 3. A centrifugal pump (comprising a plurality' of elements, each element including a cover plate Aforming one side of the in'- take passage, a crown ring provided with guide ,vanes which completes the intake passage, circular ridges formed on sald ,crown ring bedded in recesses provided in the volutes and forming tight joints, an intake,

volute, a rotor and a eliver'y volute, `each ofthese different parts being cast ,separatef ly; means lto assemble thel intake volute with t e cover` plate on one' hand and the delivery volute on the other and a bracing crown `ring interposed; between each two elements.

'guide vanes which 'completes the intake passage, circular rldges formed on sa1dcrown 4. A centrifugal pump comprising a lurality of elements, each element inclu ing a cover plate forming one side of the -intake passage, a crown ring provided with ring bedded in recesses providedI iny the volute, a rotor and a delivery volutejfeach of these'dii'erent parts being cast separately; means to assemble the intake volute with the cover plate on one hand and the de'- livery voluteon the otherand a bracing crown ring interposed between each two elements, a ball bearing supporting the shaft and a cap mounte'd'onl the extension of one `ot the pump covers and carrying the-shaft,

a bush and a ring surroundedv by water under pressure. y 5. A.v centrifugal pump'comprising a cover plate vforming one side of the intake passage, a crown ring provided with guide vanes which completes the intake passage, an intake volute, a rotor provided with a hub, a delivery volute, each of these dif ferent parts being cast separately, means to assemble the intake 'volute with the coverv plate .on one hand and the delivery volute on the other, a socket forming extension of the cover plate and surrounding the pump shaft and the hub of the rotor.

6. A centrifugal pump comprising'a plu- `rality of elements, each element including acover plate forming one side of the intake passage, a crown ring provided with guide vanes which completes the intake passage, an intake volute, a rotor and a delivery volute, each of these dierent parts being cast separately, means to assemble/the lintake volute with the cover plate on one 'hand and the delivery volute on the other, and a bracing crown ring interposed between each two elements; a socket 'forming extension of the cover plate anddsurrounding the pumpk shaft and thehub of the rotor.

Y A centrifugal pump comprising a plurality-ofelements, each element including a cover'plateforming one side of the intake passage, -a cr'own ring provided with I guide vanes which completes the intake passage, circular ridges formed on said crown ring bedded in recesses provided in the lvolutes and forming ti ht joints, an intake volute, a rotor and a delivery volute, each of these dil'erent-parts being cast separately; means to assemble the intake volute with the cover plate on one hand and the delivery volute on the otherfand a bracing crown ring interposed between each two elements, asocket forming extension of the cover llate and surrounding the pump shaft an the hub of the rotor.

8. A centrifugal pump comprising a cover plate forming' one side of the intake passage, an intake volute, a rotor, a, delivery .volutes and forming tight joints, an intake Y l@ l0; ln a centrifugal pump, a cover plate volute, the cover plate, intake volute, rotor and delivery volute bein cast separately,

.and means .to assemble t e intake and deforming one side of the intuire w rotor provided with u, hub, en a socket formingv extension on the cover plate tially riving the pip sheft and hu of the rotor.

` 11. lin a centrifugal pump, a cover plate forming one side of the intake assage, e rotor provided with a hub, e sha support',- ing Sa1d`rotor, .and a socket forming extension carried by the cover plate reiving the shaft and hub und arranged to direct incoming Huid against the rotor.

ra; ervnu'u.

' y lin testimony whereof l ex my signature. 

